Nero,Shepherd of the Lost

When Nero,Shepherd of the Lost enters the battlefield, put a hex counter on target creature you don't control.
Creatures with hex counters have "When this creature dies, gain 1 life and create a 1/1 black Bird creature token with lifelink."
At the beginning of your endstep,if a creature with a hex counter died this turn put a hex counter on a creature you don't control.
{b}{b}{w}{t}:Creatures you control have shroud until the end of turn.